Frequency domain complex permittivity measurements at microwave frequencies

Křupka, J.

doi:10.1088/0957-0233/17/6/r01

Cited by 333 publications

(222 citation statements)

References 68 publications

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“…[11,12]. Dielectric properties measurement strategies include waveguide cells (in reflection or/and transmission), resonators and free-space methods [13][14][15][16]. Dielectric-loaded cylindrical waveguides and cavities can provide new and accurate dielectric measurement procedures to be applied under these methodologies [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Peñaranda‐Foix

Janezic

Catalá-Civera

et al. 2012

IEEE Trans. Microwave Theory Techn.

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Penaranda-Foix, FL.; Janezic, MD.; Catalá Civera, JM.; Canós Marín, AJ. (2012). Full-wave analysis of dielectric-loaded cylindrical waveguides and cavities using a new four-port ring network. IEEE Transactions on Microwave Theory and Techniques. 60(9):2730-2740. doi:10.1109/TMTT.2012.2206048. > REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1 Abstract-In this paper, a full-wave method for the electromagnetic analysis of dielectric-loaded cylindrical and coaxial waveguides and cavities is developed. For this purpose, a new 4-port ring network is proposed, and the mode-matching method is applied to calculate the Generalized Admittance Matrix (GAM) of this new structure. A number of analyses on dielectric-loaded waveguide structures and cavities have been conducted in order to validate and to assess the accuracy of the new approach. The results have been compared with theoretical values, numerical modeling from the literature, and data from commercial electromagnetic simulators. The method has been also applied to the accurate determination of dielectric properties, and we provide an example of these measurements as another way to validate this new method.

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Section: Introductionmentioning

confidence: 99%

Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Peñaranda‐Foix

Janezic

Catalá-Civera

et al. 2012

IEEE Trans. Microwave Theory Techn.

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“…An LCR meter or dielectric impedance meter is usually used in the parallel-plate capacitance method and a vector network analyzer is usually used for measurement in the transmission reflection method, coaxial probe method, free-space method and resonant cavity method. The parallel-plate capacitance method has high test accuracy but it has a low frequency range (HP); the transmission reflection method, coaxial probe method, and free-space method can be used to measure broadband but they tend to measure media with low loss inaccurately (Venkatesh and Raghavan 2005;Krupka 2006). The resonant cavity method is especially suitable for test for low-loss medium in terms of test accuracy, but the test is typically conducted at a certain frequency point (Venkatesh and Raghavan 2005).…”

Section: Test Methods For Dielectric Propertiesmentioning

confidence: 99%

Progress of the technique of coal microwave desulfurization

Tao

Xie

et al. 2014

Int J Coal Sci Technol

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With the advantages of its fast speed, effective and moderate controllable conditions, desulfurization of coal by microwave has become research focus in the field of clean coal technology. Coal is a homogeneous mixture which consists of various components with different dielectric properties, so their abilities to absorb microwaves are different, and the sulfur-containing components are better absorbers of microwave, which makes them can be selectively heated and reacted under microwave irradiation. There still remain controversies on the principle of microwave desulfurization at present, thermal effects or non-thermal effects. The point of thermal effects of microwave is mainly base on its characters of rapidly and selectly heating. While, in view of non-thermal effect, direct interactions between the microwave electromagnetic field and sulfur containing components are proposed. It is a fundamental problem to determine the dielectric properties of coal and the sulfur-containing components to reveal the interaction of microwave and sulfur-containing compounds. However, the test of dielectric property of coal is affected by many factors, which makes it difficult to measure dielectric properties accurately. In order to achieve better desulfurization effect, the researchers employ methods of adding chemical additives such as acid, alkali, oxidant, reductant, or changing the reaction atmosphere, or combining with other methods such as magnetic separation, ultrasonic and microorganism. Researchers in this field have also put forward several processes, and have obtained a number of patents. Obscurity of microwave desulfurization mechanism, uncertainties in qualitative and quantitative analysis of sulfur-containing functional groups in coal, and the lack of special microwave equipment have limited further development of microwave desulfurization technology.

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“…Of all available methods, resonant techniques are particularly attractive for highprecision measurements of real and imaginary parts of complex dielectric constant [9][10][11][12]. The most impressive results were achieved with high-quality open resonators employing large-area mirrors and providing quality factors (Q factors) exceeding 6 · 10 5 at the frequencies f ∼ 100 GHz [9].…”

Section: Introductionmentioning

confidence: 99%

Mm-Wave Dielectric Parameters of Magnesium Fluoride Glass Wafers

Yurchenko¹,

Çiydem²,

Grądziel³

et al. 2017

PIER M

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Abstract-We measured millimeter-wave dielectric parameters of magnesium fluoride glass wafers at the room temperature in the frequency band of 75-110 GHz by applying the open resonator technique based on the use of Bragg structures and related multi-layer assemblies. Through the comparison of measured and simulated transmission spectra of various structures, the dielectric constant of magnesium fluoride glass is found as ε = 5.50±0.01. The estimate for the loss tangent is found to be tan δ = 0.00005, with a possibility that the actual losses could be smaller than this value.

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Frequency domain complex permittivity measurements at microwave frequencies

Cited by 333 publications

References 68 publications

Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Progress of the technique of coal microwave desulfurization

Mm-Wave Dielectric Parameters of Magnesium Fluoride Glass Wafers

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